Shank of grinding pen



FIG. 1.is a top, front right side perspective view thereof;

FIG. 2.is a front elevational view thereof;

FIG. 3.is a rear elevational view thereof;

FIG. 4.is a left plan view thereof;

FIG. 5.is a right plan view thereof;

FIG. 6.is a top plan view thereof; and,

FIG. 7.is a bottom plan view thereof.

The ornamental design for shank of grinding pen, as shown and described.